package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.ICategoryService;
import com.itheima.reggie.service.IDishService;
import com.itheima.reggie.service.ISetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category>
        implements ICategoryService {


    @Autowired
    private IDishService dishService;
    @Autowired
    private ISetmealService setmealService;

    /*根据id删除分类,删除 之前需要进行判断
     * @param id
     * */

    @Override
    public void remove(Long id) {

        //添加查询条件,根据分类id 进行查询菜品数据
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();

        dishLambdaQueryWrapper.eq(Dish::getCategoryId, id);

        int count1 = dishService.count(dishLambdaQueryWrapper);
        //如果已经关联,抛出一个业务异常
        if (count1 > 0) {
            throw new CustomException("当前分类下关联了菜品,不能删除");//已经关联菜品,抛出一个业务异常
        }


        //查询当前分类是否关联了套餐,如果已经关联,抛出一个业务异常
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId, id);

        int count2 = setmealService.count(setmealLambdaQueryWrapper);

        if (count2 > 0) {
            throw new CustomException("当前分类下关联了套餐,不能删除");//已经关联套餐,抛出一个业务异常
        }
        //正常删除分类
        super.removeById(id);

    }
}
